计算求值:(1)cosπ3+tan3π4-sin(?5π6)-sin3π2(2)sin25π6+cos(-15π4)+tan13π3-cos11π4
计算求值:(1)cosπ3+tan3π4-sin(?5π6)-sin3π2(2)sin25π6+cos(-15π4)+tan13π3-cos11π4....
计算求值:(1)cosπ3+tan3π4-sin(?5π6)-sin3π2(2)sin25π6+cos(-15π4)+tan13π3-cos11π4.
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(1)原式=cos
+tan(π?
)+sin(π-
)-sin(π+
)
=
-tan
+sin
+sin
=
-1+
+1
=1
(2)原式=sin(4π+
)+cos(
-4π)+tan(
+4π)-cos(3π-
)
=sin
-cos
+tan
+cos
=
-
+
+
π |
3 |
π |
4 |
π |
6 |
π |
2 |
=
1 |
2 |
π |
4 |
π |
6 |
π |
2 |
=
1 |
2 |
1 |
2 |
=1
(2)原式=sin(4π+
π |
6 |
π |
4 |
π |
3 |
π |
4 |
=sin
π |
6 |
π |
4 |
π |
3 |
π |
4 |
=
1 |
2 |
| ||
2 |
3 |
|